You really can't even begin to compare dropping out of college and dropping out of High School.
College has a much better chance of being enjoyable. Your more on your own, doing your own thing, and it's easier to just stay out of things you want to avoid. There's also a lot of jobs you can do without being completely ignored in the interview if you drop out of college. And most importantly, while having a High School degree is free, or cheap to get a GED, a College degree is extremely expensive. It takes up 4 years you could be working, tens of thousands of dollars, plus things like books. If what you want to do doesn't require a degree (Or at least, not a degree right now) then going to college will just put you in debt, and take away 4 years or so of work experience. But unless you're shooting for the absolute worst of the minimum wage jobs, people will be weary of you if you don't have at least a GED. And actually, even some low level jobs might look on you poorly if you just have a GED instead of a high school diploma.
At the very least, get your GED.
And yes, I know the idea of studying whatever you want sounds great, but it doesn't really work that way. In reality, an employer isn't going to take your word for it that you educated yourself well. Even if you did. They want to see the piece of paper that says you got the education you need, even if that piece of paper isn't worth the paper it's printed on, for all that it matters to what you actually learned.